fix: avoid implicit API key imports

scripts/setup-api.sh

@@ -1,18 +1,19 @@
 #!/bin/bash
 # T3MP3ST API Key Setup Script
 
+set -euo pipefail
+umask 077
+
 echo ""
 echo "╔═══════════════════════════════════════════════════════════╗"
 echo "║           T3MP3ST API KEY CONFIGURATION                   ║"
 echo "╚═══════════════════════════════════════════════════════════╝"
 echo ""
 
-# Check if .env exists
 ENV_FILE="$(dirname "$0")/../.env"
 
 if [ -f "$ENV_FILE" ]; then
-    echo "[*] Existing .env file found"
-    source "$ENV_FILE"
+    echo "[*] Existing .env file found; it will be replaced after you enter a new key."
 fi
 
 echo ""
@@ -22,29 +23,38 @@ echo "  2) Anthropic (Claude direct)"
 echo "  3) OpenAI (GPT models)"
 echo ""
 
-read -p "Enter choice [1-3]: " choice
+read -r -p "Enter choice [1-3]: " choice
 
 case $choice in
     1)
         echo ""
         echo "Get your OpenRouter API key at: https://openrouter.ai/keys"
-        read -p "Enter your OpenRouter API key: " api_key
-        echo "OPENROUTER_API_KEY=$api_key" > "$ENV_FILE"
-        echo "LLM_PROVIDER=openrouter" >> "$ENV_FILE"
+        read -rsp "Enter your OpenRouter API key: " api_key
+        echo ""
+        {
+            printf 'OPENROUTER_API_KEY=%s\n' "$api_key"
+            printf 'LLM_PROVIDER=openrouter\n'
+        } > "$ENV_FILE"
         ;;
     2)
         echo ""
         echo "Get your Anthropic API key at: https://console.anthropic.com/"
-        read -p "Enter your Anthropic API key: " api_key
-        echo "ANTHROPIC_API_KEY=$api_key" > "$ENV_FILE"
-        echo "LLM_PROVIDER=anthropic" >> "$ENV_FILE"
+        read -rsp "Enter your Anthropic API key: " api_key
+        echo ""
+        {
+            printf 'ANTHROPIC_API_KEY=%s\n' "$api_key"
+            printf 'LLM_PROVIDER=anthropic\n'
+        } > "$ENV_FILE"
         ;;
     3)
         echo ""
         echo "Get your OpenAI API key at: https://platform.openai.com/api-keys"
-        read -p "Enter your OpenAI API key: " api_key
-        echo "OPENAI_API_KEY=$api_key" > "$ENV_FILE"
-        echo "LLM_PROVIDER=openai" >> "$ENV_FILE"
+        read -rsp "Enter your OpenAI API key: " api_key
+        echo ""
+        {
+            printf 'OPENAI_API_KEY=%s\n' "$api_key"
+            printf 'LLM_PROVIDER=openai\n'
+        } > "$ENV_FILE"
         ;;
     *)
         echo "Invalid choice"
@@ -52,6 +62,8 @@ case $choice in
         ;;
 esac
 
+chmod 600 "$ENV_FILE"
+
 # Add .env to gitignore if not already there
 GITIGNORE="$(dirname "$0")/../.gitignore"
 if [ -f "$GITIGNORE" ]; then
@@ -69,7 +81,7 @@ echo "╔═══════════════════════
 echo "║              CONFIGURATION COMPLETE!                       ║"
 echo "╚═══════════════════════════════════════════════════════════╝"
 echo ""
-echo "Your API key has been saved to .env"
+echo "Your API key has been saved to .env (mode 600)"
 echo ""
 echo "Start the server with:"
 echo "  npm run server"

src/__tests__/api-key-env-static.test.ts

@@ -0,0 +1,37 @@
+import { describe, expect, it } from 'vitest';
+import { readFileSync } from 'fs';
+import { join } from 'path';
+
+const configSource = readFileSync(join(process.cwd(), 'src/config/index.ts'), 'utf8');
+const setupScript = readFileSync(join(process.cwd(), 'scripts/setup-api.sh'), 'utf8');
+
+function configLoadEnvBlock(): string {
+  const start = configSource.indexOf('private loadEnvVariables(): void');
+  expect(start).toBeGreaterThanOrEqual(0);
+  const end = configSource.indexOf('\n  /**\n   * Get all settings', start);
+  expect(end).toBeGreaterThan(start);
+  return configSource.slice(start, end);
+}
+
+describe('API key environment handling hardening', () => {
+  it('ConfigManager does not implicitly read .env from the caller working directory', () => {
+    const block = configLoadEnvBlock();
+
+    expect(block).not.toContain("join(process.cwd(), '.env')");
+    expect(block).toContain("join(homedir(), '.t3mp3st', '.env')");
+  });
+
+  it('ConfigManager uses env keys in-memory and does not persist imported env keys', () => {
+    const block = configLoadEnvBlock();
+
+    expect(block).not.toMatch(/setApiKey\(/);
+    expect(block).not.toMatch(/config\.set\(['"]apiKeys['"]/);
+  });
+
+  it('setup-api.sh never sources .env and reads API keys silently into a 0600 file', () => {
+    expect(setupScript).not.toMatch(/\bsource\s+["']?\$ENV_FILE/);
+    expect(setupScript).toMatch(/umask\s+077/);
+    expect(setupScript).toMatch(/read\s+-rsp\s+"Enter your OpenRouter API key:/);
+    expect(setupScript).toMatch(/chmod\s+600\s+"\$ENV_FILE"/);
+  });
+});

src/config/index.ts

@@ -452,9 +452,10 @@ class ConfigManager {
   private loadEnvVariables(): void {
     if (this.envLoaded) return;
 
-    // Try to load from .env file in current directory or home
+    // Load only T3MP3ST-owned/home env files. Do NOT read process.cwd()/.env:
+    // operators often run T3MP3ST inside target repos, and importing that repo's
+    // secrets would contaminate this process with unrelated credentials.
     const envPaths = [
-      join(process.cwd(), '.env'),
       join(homedir(), '.t3mp3st', '.env'),
       join(homedir(), '.env'),
     ];
@@ -482,23 +483,9 @@ class ConfigManager {
       }
     }
 
-    // Check environment variables for API keys
-    const envKeys = {
-      openrouter: process.env.OPENROUTER_API_KEY,
-      venice: process.env.VENICE_API_KEY,
-      anthropic: process.env.ANTHROPIC_API_KEY,
-      openai: process.env.OPENAI_API_KEY,
-    };
-
-    // Only set from env if not already set in config
-    const currentKeys = this.config.get('apiKeys');
-
-    for (const [provider, envKey] of Object.entries(envKeys)) {
-      if (envKey && !currentKeys[provider as keyof typeof currentKeys]) {
-        this.setApiKey(provider as 'openrouter' | 'venice' | 'anthropic' | 'openai', envKey);
-      }
-    }
-
+    // Environment variables (including values loaded from ~/.t3mp3st/.env above)
+    // are intentionally process-local. getApiKey() already gives env vars highest
+    // priority, so do not persist them into Conf's apiKeys store as a side effect.
     this.envLoaded = true;
   }